91mm fork air gap question?

[beuleux]

The air gap in the forks gives the oil space to move into as it compresses when you brake. If you had no gap, the forks couldn't compress at all, because the system would be completely sealed.

The only effect changing the air gap has is that it effectively acts as an extra "spring" when the forks are approaching full compression, ie the air gets squashed by the oil and should stop the springs from bottoming out.

If the air gap is too big, the springs will bottom out under hard braking, meaning they can't absorb any more bumps.

It might be worth draining the forks into a measuring jug and checking you didn't get the amount wrong in the first place by mistake (not that I've ever done that...)

Thanks,  and yes I understand what you're saying, I was wondering if there could be any manufacturing differences between tubes or any wear factor which could account for the difference, I have been known to make the odd catastrophic error so I was very careful to measure very precisely and made sure there was 455ml left in the one litre bottle, I will double check the gap again in the morning when I do the other leg, could it be possible I filled the damper assembly too much when I pumped the rod and it needs to resettle
Thanks ?